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Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed Related to Properties Acquired (Parenthetical) (Detail) (2015 New Real Estate Activity [Member], USD $) | 3 Months Ended
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Mar. 31, 2015
2015 New Real Estate Activity [Member] |
Business Acquisition Purchase Price Allocation [Line Items] |
Acquisition costs were direct costs incurred related to leases | $ 2,625 us-gaap_AcquisitionCosts / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember

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- Details
Name: | land_BusinessAcquisitionPurchasePriceAllocationLineItems
Namespace Prefix: | land_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
Name: | us-gaap_AcquisitionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration